allow guest user applications read CNTVCT_EL0/CNTFRQ_EL0
allow guest user applications read CNTVCT_EL0/CNTFRQ_EL0

At present, when doing syscall_kvm test, we need to
enable the function of ESR_ELx_SYS64_ISS_SYS_CNTVCT/ESR_ELx_SYS64_ISS_SYS_CNTFRQ to
successfully pass the test.

I set CNTKCTL_EL1.EL0VCTEN==1/CNTKCTL_EL1.EL0PCTEN==1, so that the related cases can passed.

Signed-off-by: Bin Lu <41939a7239578d75c9fd5382ed581915f2bfc9f1@arm.com>

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor