[][kernel][common][Refactor dhrystone backport patch path]

[Description]
Refactor dhrystone backport patch path from backport-5.4 to patch-5.4.
Rename patch w/ backport kernel version v6.3 to follow internal
backport naming rule 999-1xxx-v[0-9].[0-9].

[Release-log]
N/A

Change-Id: I447a6ab716687115dc05d42079f07fcb16b29924
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8285789
diff --git a/target/linux/generic/backport-5.4/999-1900-lib-add-Dhrystone-benchmark-test.patch b/target/linux/mediatek/patches-5.4/999-1900-v6.3-lib-add-Dhrystone-benchmark-test.patch
similarity index 100%
rename from target/linux/generic/backport-5.4/999-1900-lib-add-Dhrystone-benchmark-test.patch
rename to target/linux/mediatek/patches-5.4/999-1900-v6.3-lib-add-Dhrystone-benchmark-test.patch