arm64: entry: Explicitly pass exception level to kernel_ventry macro

arm64: entry: Explicitly pass exception level to kernel_ventry macro

commit 5b1f7fe41909 upstream.

We will need to treat exceptions from EL0 differently in kernel_ventry,
so rework the macro to take the exception level as an argument and
construct the branch target using that.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Conflicts:
	no vmap_stack in arch/arm64/kernel/entry.S