drivers: irqchip: qcom-pdc: Do not set spi type during alloc

SPI type is set in spi configure registers during irq_set_type.
Do not set type before alloc is done at parent GIC.

Change-Id: Idc23be422a2ed756a00b086560f697bb44f3666c
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>