of: Fix wrong kmemleak ignore in reserved_mem

of: Fix wrong kmemleak ignore in reserved_mem

If size is 0, then kmemleak object found for ignore object is not
properly working and ignore should work for create kmemleak object.
Fix the wrong kmemleak ignore usages in of_reserved_mem.

This removes below kmemleak warnings:
   kmemleak: Not scanning unknown object at 0xffffffc0f4807000
   kmemleak: Not scanning unknown object at 0xffffffc0f4800000
   kmemleak: Not scanning unknown object at 0xffffffc007400000
   ...
   [<ffffff900af159b0>] kmemleak_no_scan+0xd8/0xe8
   [<ffffff900ba72d1c>] kmemleak_init+0x260/0x504
   ..
   kmemleak: Early log backtrace:
      log_early+0x1d8/0x268
      kmemleak_no_scan+0xbc/0xe8
      fdt_init_reserved_mem+0x8b4/0x928
      early_init_fdt_scan_reserved_mem+0x100/0x13c
      arm64_memblock_init+0x310/0x388
   ...

Change-Id: Idac1f672b06373f6eb7485d63b60747f2cf9f5b5
Fixes: commit 47a87b6930cd ("kmemleak: shouldn't scan reserved memory")
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>