ARM: i.MX: Remove i.MX1 Armadeus APF9328 board support

mach-apf9328.c can be replaced with devicetree equivalent: imx1-apf9328.dts,
so remove the board file.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>