Removes the non-PIC disabling PIC code as the PIC is not a supported interrupt
controller. The PIC disabling code remains as it is needed to prevent the
generation of spurious interrupts from the PIC (see CONFIG_SHUTOFF_PIC).
Change-Id: Ic59aa17ab96f34685a5d7b5f24cab391de47edca
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>