vc4: Enable NEON asm on meson cross-builds.
The core Mesa with_asm_arch and USE_ARM_ASM flags are disabled for meson cross-builds because of the need to run host binaries on the build system. vc4 doesn't need to do that, so skip with_asm_arch to enable NEON on my cross-builds. Fixes: ebcb4c21 ("meson: Enable VC4's NEON assembly support.")
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