x86: fix operand modifiers in IRQ_CONNECT()

It's not entirely clear where the '%P' came from, but the proper,
documented operand modifier for inserting an immediate value without
punctuation is '%c'.

Change-Id: I17346a6c70183ce79e91faa2fbe61e7761dfd513
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
1 file changed