riscv: Fix incorrect use of REG_L for 32-bit types in sse_entry.S

[GooTal]

community inclusion
category: bugfix
bugzilla: #288

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The REG_L macro was mistakenly used to handle 32-bit data types. Changed it to lw.

This bug previously caused the SSE handling flow to incorrectly take the slow path, and some cores were unable to enter the SSE processing flow at all.

[github-actions]

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开始测试 log: https://github.com/RVCK-Project/rvck/actions/runs/26625864694

参数解析结果

args	value
repository	RVCK-Project/rvck
head ref	pull/293/head
base ref	rvck-6.6
LAVA repo	RVCK-Project/lavaci
LAVA hardware	['qemu']
LAVA Testcase path	lava-testcases/common-test/ltp/ltp.yaml
need run job	kunit-test,kernel-build,check-patch,lava-trigger

---

测试完成

详细结果:

check	result
kunit-test	success
kernel-build	success
check-patch	success
lava-trigger-qemu	success
lava-trigger-sg2042	skipped
lava-trigger-k1	skipped
lava-trigger-lpi4a	skipped

Kunit Test Result

[08:10:03] Testing complete. Ran 457 tests: passed: 445, skipped: 12

• detail log: https://github.com/RVCK-Project/rvck/actions/runs/26625864694/attempts/1/#summary-78462339370

Kernel Build Result

• Kernel build succeeded: RVCK-Project/rvck/293_26625864694_1/

• 2488aaefeaef1498dff23412b4179cf1 /srv/guix_result/6b1f15b44fb86f5db7fa3f6e9a16326dbe7bd47f/Image

• 310b505760eca9ddfc775641c0b7df18 /root/initramfs.img

• detail log: https://github.com/RVCK-Project/rvck/actions/runs/26625864694/attempts/1/#summary-78462339346

Check Patch Result

Total Errors	0
Total Warnings	2

• detail log: https://github.com/RVCK-Project/rvck/actions/runs/26625864694/attempts/1/#summary-78462339339

LAVA Check (qemu)

args	value
testcase_repo	RVCK-Project/lavaci
lava_template	lava-job-template/qemu/qemu-ltp.yaml
testcase_path	lava-testcases/common-test/ltp/ltp.yaml
kernel_download_url	http://10.30.190.110/openEuler-RISC-V/RVCK/OERV-RVCI/RVCK-Project/rvck/293_26625864694_1/Image
initramfs_download_url	http://10.30.190.110/openEuler-RISC-V/RVCK/OERV-RVCI/RVCK-Project/rvck/293_26625864694_1/initramfs.img
rootfs_download_url	https://fast-mirror.isrc.ac.cn/openeuler-sig-riscv/openEuler-RISC-V/RVCK/openEuler24.03-LTS-SP1/openeuler-rootfs.img.zst
testcase_ref	main
testitem_name	RVCK-Project_rvck_pull_request_target_293__common-test_qemu

result: Lava check done!

• lava log: https://lava.oerv.ac.cn/scheduler/job/2977

• lava result count: [pass]: 10

• detail log: https://github.com/RVCK-Project/rvck/actions/runs/26625864694/attempts/1/#summary-78491452623