ANDROID: arm64: Fix up CTR_EL0 L1Ip handling.

A partial backport of sysreg naming changes broke extraction of the
L1Ip field from CTR_EL0. Revert the CTR_L1IP() macro to an earlier,
correct form.

Signed-off-by: Keir Fraser <keirf@google.com>
Bug: 233588291
Fixes: f660cd96 ("BACKPORT: arm64/sysreg: Standardise naming for CTR_EL0 fields")
Change-Id: I8d46ad5e266c5792239066b16fbc78762706c023