Split VORTEXM4 from VORTEX target and fix SGEMM_DIRECT support for SME-capable targets #6399

Job	Run time
neoverse_build	33s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	3m 53s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	3m 59s
msys2 (UCRT64, int64, Release)	3m 47s
msys2 (UCRT64, int32, Release)	14s
msys2 (CLANG64, int32, Release)	1s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	3m 35s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	3m 30s
msys2 (MINGW32, int32, Release)	1s
msys2 (CLANG64, int64, Release)	1s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	3m 47s
build (ubuntu-latest, clang, gfortran, make)	1s
build (ubuntu-latest, gcc, flang, make)	1s
build (ubuntu-latest, clang, gfortran, cmake)	1s
build (ubuntu-latest, gcc, gfortran, cmake)	1s
build (macos-latest, clang, gfortran, cmake)	1s
build (ubuntu-latest, gcc, flang, cmake)	1s
build (ubuntu-24.04-arm, clang, gfortran, make)	3m 47s
build (ubuntu-latest, gcc, gfortran, make)	1s
build (ubuntu-latest, clang, flang, make)	1s
build (ubuntu-latest, clang-21, flang, make)	1s
build (ubuntu-latest, clang, flang, cmake)	3m 47s
build (ubuntu-latest, clang-21, gfortran, cmake)	1s
build (ubuntu-24.04-arm, gcc, gfortran, make)	1s
build (ubuntu-24.04-arm, clang, gfortran, cmake)	3m 47s
build (ubuntu-24.04-arm, clang-21, gfortran, make)	3m 47s
build (macos-latest, clang, gfortran, make)	1s
build (ubuntu-latest, clang-21, flang, cmake)	1s
build (ubuntu-24.04-arm, clang-21, gfortran, cmake)	1s
build (ubuntu-24.04-arm, gcc, gfortran, cmake)	1s
build (ubuntu-latest, clang-21, gfortran, make)	1s
	38m 45s

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