ARM: defconfig: axm55xx: Drop PL11x graphics driver

The defconfig for the AXM55xx includes the ARM CLCD
(PL11x) PrimeCell framebuffer driver, but the device tree
for this platform does not include this hardware, nor do I
find it likely that this chip has graphics.

Drop these config items.

Cc: John Logan <john.logan@intel.com>
Cc: Anders Roxell <anders.roxell@linaro.org>
Acked-by: Krzysztof Adamski <krzysztof.adamski@nokia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>