add fp-armv8 for ARM_ALLOWED_FEATURES
add fp-armv8 for ARM_ALLOWED_FEATURES

graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust