soc: spcom: Addressing KASAN issue slab-out-of-bounds

This change blocks access to channel name string,
in case channel name string length is more than permissible limits.

Change-Id: I2fe0b32498bc74011b1d42bb3c056c7e174494ca
Signed-off-by: rakegand <quic_rakegand@quicinc.com>