ANDROID: KVM: arm64: Add missing icache sync before pKVM module loading

Before calling the EL2 init function of a pKVM module, we apply
relocations to the text section. Ensure those relocations are visible to
all CPUs at EL2 before we jump into the init function.

Bug: 362409404
Bug: 278749606
Bug: 244543039
Bug: 244373730
Fixes: be027b19 ("ANDROID: KVM: arm64: Allow loading modules to the pKVM hypervisor")
Change-Id: I4b2ae7f18ca8f28d4ff7f5eee1158bd7c2efc0a3
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>