drivers: qcom: cmd-db: Initialize resource name

Resource name must be initialized otherwise it will contain a garbage
value which will cause a crash when it is dereferenced, such as when a
user calls 'cat /proc/iomem'.

Initialize to name to NULL and let the devm_ioremap_resource call assign
the device name as the name.

Change-Id: I4667a288bc6dcf68aeb46c62fc4be86788fd8887
Signed-off-by: Liam Mark <lmark@codeaurora.org>