ARM: omap2: gpmc: fix compilation warning

Fix the following compilation warning:

  arch/arm/mach-omap2/gpmc.c: In function 'gpmc_probe_generic_child':
  arch/arm/mach-omap2/gpmc.c:1477:4: warning: format '%x' expects argument of type 'unsigned int', but argument 4 has type 'resource_size_t' [-Wformat]

Signed-off-by: Vincent Stehlé <v-stehle@ti.com>
Cc: trivial@kernel.org
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Signed-off-by: Vincent Stehlé <v-stehle@ti.com>