asoc: Avoid usage of variable length array

chmap in msm_lsm_check_and_set_lab_controls, data in
wcd9xxx_i2c_write_device and irq_level in wcd9xxx_irq_init
are Variable Length Array (VLA). VLAs are considered unfit
when it comes to security, performance, code quality and so
on. Hence, allocate the memory dynamically.

Change-Id: I52f33e61f857a00774eb26dc1d6372f2ed3d425c
Signed-off-by: Meng Wang <mengw@codeaurora.org>