mkbootimg: Support 32K 64K and 128K pagesizes

Signed-off-by: ChampionSwimmer <android@championswimmer.tk>
Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I0ee608b74a1daefe536b9247f99368f3e043f93d

Conflicts:
	mkbootimg/mkbootimg.c