aarch64: update Ampere-1 core definition

aarch64: update Ampere-1 core definition

This brings the extensions detected by -mcpu=native on Ampere-1 systems
in sync with the defaults generated for -mcpu=ampere1.

Note that some early kernel versions on Ampere1 may misreport the
presence of PAUTH and PREDRES (i.e., -mcpu=native will add 'nopauth'
and 'nopredres').

gcc/ChangeLog:

	* config/aarch64/aarch64-cores.def (AARCH64_CORE): Update
	Ampere-1 core entry.

Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>