KVM: arm64: Page-align the .hyp sections

We will soon unmap the .hyp sections from the host stage 2 in Protected
nVHE mode, which obviously works with at least page granularity, so make
sure to align them correctly.

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210319100146.1149909-37-qperret@google.com