arch-armv7a.inc: fix armv7a-vfp-neon -> armv7a compat case

arch-armv7a.inc: fix armv7a-vfp-neon -> armv7a compat case

Without this 'armv7a' is used as TUNE_ARCH but does *not* end up in PACKAGE_EXTRA_ARCHS:

arch all 1
arch any 6
arch noarch 11
arch arm 16
arch armv4 21
arch armv4t 26
arch armv5 31
arch armv5t 36
arch armv5-vfp 41
arch armv5t-vfp 46
arch armv5e 51
arch armv5te 56
arch armv5e-vfp 61
arch armv5te-vfp 66
arch armv6-vfp 71
arch armv6t-vfp 76
arch armv7-vfp 81
arch armv7t2-vfp 86
arch armv7a-vfp 91
arch armv7at2-vfp 96
arch armv7a-vfp-neon 101
arch armv7at2-vfp-neon 106
arch beagleboard 111

Which leads to a failing do_rootfs

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>