techpack: audio: Bump wcd_cpe state buffer

This silences the following compilation warning:

../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") +
        ^

Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>
Change-Id: I4926260ffa518ead04fae35857198fcec8bc025f
Signed-off-by: TogoFire <italomellopereira@gmail.com>
Signed-off-by: improbir <ghosh_probir@yahoo.com>