ARM: 7304/1: ioremap: fix boundary check when reusing static mapping

ARM: 7304/1: ioremap: fix boundary check when reusing static mapping

Since commit 825f0aca846eee5dbc96ff2901b0127adf5312df "ARM: add
generic ioremap optimization by reusing static mappings" ioremap()
is trying to reuse existing static mapping when possible.

The condition checking boundaries of the requested and existing
mappings didn't take in-page offset into consideration though,
which lead to obscure and hard to debug problems when requested
mapping crossed end of the static one.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>