mm/dmapool.c: replace hard coded function name with __func__

mm/dmapool.c: replace hard coded function name with __func__

No need to hard code function name when __func__ can be used.

While here, replace specifiers for special types like dma_addr_t.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Link: http://lkml.kernel.org/r/20200814135055.24898-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>