ARM64 DYNAMIC_ARCH: add CortexA75/76 and restore VORTEX for DYNAMIC_LIST #2145

Job	Run time
TEST (LOONGSON2K1000, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON2K1000)	9m 19s
TEST (LOONGSONGENERIC, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSONGENERIC)	7m 58s
TEST (LOONGSON3R5, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON3R5)	9m 29s
TEST (LA464, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA464)	9m 0s
TEST (LA264, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA264)	7m 49s
TEST (LA64_GENERIC, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA64_GENERIC)	7m 42s
TEST (DYNAMIC_ARCH, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=GENERIC)	15m 12s
	1h 6m 29s

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