iwlwifi: yoyo: don't block dumping internal memory when not in SRAM mode

When we have an assert during D3 we want to dump the internal
buffer memory even if are we working in DRAM debug mode.  We should not
block dumping it.

Change-Id: I69aad2d4904c4f8bb653c61e8781a2e07780054f
Signed-off-by: Rotem Saado <rotem.saado@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>