Update galileo minimal footprint configuration

The galileo minimal footprint project requires at least 53 IDT entries
to accommodate the HPET.  This is due to the current algorithm used to
map an IRQ number to an interrupt vector.
            Interrupt vector = IRQ number + 0x20

Change-Id: I6de2cd72da631af04237615082823e7de65d8b22
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>