spi: mxc_spi: Fix build warning on ARM64 platforms

spi: mxc_spi: Fix build warning on ARM64 platforms

When building mxc_spi driver on ARM64 platforms, get below build warnings.
Fix it in this patch.

In file included from include/common.h:48:0,
 from drivers/spi/mxc_spi.c:9:
 drivers/spi/mxc_spi.c: In function ‘spi_xchg_single’:
drivers/spi/mxc_spi.c:232:21: warning: cast from pointer to integer of
different size [-Wpointer-to-int-cast]
 _func_, bitlen, (u32)dout, (u32)din);
 ^
 include/log.h:135:26: note: in definition of macro ‘debug_cond’
printf(pr_fmt(fmt), ##args); \
 ^~~~
 drivers/spi/mxc_spi.c:231:2: note: in expansion of macro ‘debug’
debug("%s: bitlen %d dout 0x%x din 0x%x\n",
 ^~~~~
 drivers/spi/mxc_spi.c:232:32: warning: cast from pointer to integer of
different size [-Wpointer-to-int-cast]
 _func_, bitlen, (u32)dout, (u32)din);
 ^
 include/log.h:135:26: note: in definition of macro ‘debug_cond’
printf(pr_fmt(fmt), ##args); \
 ^~~~
 drivers/spi/mxc_spi.c:231:2: note: in expansion of macro ‘debug’
debug("%s: bitlen %d dout 0x%x din 0x%x\n",
 ^~~~~

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>