staging: android: ion: Resolve minor indentation issue.

Resolving a minor checkpatch/indentation issue in ion_carveout_heap.c,
ie:
drivers/staging/android/ion/ion_carveout_heap.c
-----------------------------------------------
CHECK: Alignment should match open parenthesis
+static phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
+					     unsigned long size)

Signed-off-by: Matthew Giassa <matthew@giassa.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>