ASoC: wcd_cpe_core: Fix snprintf size

techpack/audio/asoc/codecs/wcd_cpe_core.c:1981:2: error: 'snprintf' size argument is too large; destination buffer has size 11, but size argument is 13 [-Werror,-Wfortify-source]
        snprintf(proc_name, (sizeof("cpe") + sizeof("_state") +
        ^
1 error generated.

Change-Id: I976c005263f44d7a97f1496304acf28df30232a1