ARM: 5930/1: Add PKMAP area description to memory.txt.

Also adapts delimiters of neighbouring modules area.

Tested-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Andreas Fenkart <andreas.fenkart@streamunlimited.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>