aarch64: Enable access to MDSELR_EL1 from EL2 and below

FEAT_Debugv8p9 adds a new MDSELR_EL1 register to select between banks of
breakpoints and watchpoints. Accesses to MDSELR_EL1 from EL2 and below trap to
EL3 unless MDCR_EL3.EBWE is set.

Enable access to MDSELR_EL1 when it is implemented.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
2 files changed