Add the missing "Unconditional Advanced SIMD and floating-point
instructions" in [1] to the VFP undef hook.

This commit addresses the issue reported in [2], where
executing the vudot instruction on a platform with FEAT_DotProd
support resulted in an undefined instruction error.

Link: https://developer.arm.com/documentation/ddi0597/2023-06/?lang=en [1]
Link: https://lore.kernel.org/lkml/20230920083907.30479-1-mark-pk.tsai@mediatek.com/ [2]
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Tested-by: Xuewen Yan <xuewen.yan@unisoc.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>