ENGR00223103 ESAI ASRC: clean build warning

ENGR00223103 ESAI ASRC: clean build warning

BUILD WARNING:
WARNING: arch/arm/mach-mx6/built-in.o(.data+0x7e44): Section mismatch in
reference from the variable sab_audio_data to the (unknown reference)
.init.rodata:(unknown) The variable sab_audio_data references the
(unknown reference) __initconst (unknown) If the reference is valid then
annotate the variable with __init* or __refdata (see linux/init.h) or
name the variable:
*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console

In this patch, remove esai_p2p struct with init attribute.

Signed-off-by: Chen Liangjun <b36089@freescale.com>