asoc: bolero: check if va is enabled when register/deregister wakeup irq

When LPI SVA is enabled, start recording and stop LPI SVA, wakeup irq
is not deregistered as tx_swr_clk_cnt is not 0. Add new check for
va_swr_clk_cnt to resolve the issue.

Change-Id: I441394f26b42f554169400194d021309ef70af9e
Signed-off-by: Meng Wang <mengw@codeaurora.org>