arm64: entry: Allow the trampoline text to occupy multiple pages

commit a9c406e6 upstream.

Adding a second set of vectors to .entry.tramp.text will make it
larger than a single 4K page.

Allow the trampoline text to occupy up to three pages by adding two
more fixmap slots. So previous changes to tramp_valias allowed it to reach
beyond a single page.

Change-Id: Iaecfa089c3c7c2edaffe257a841c3dbb0a15e1a4
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 22fdfcf1
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Kishor Krishna Bhat <quic_kishkris@quicinc.com>