ASoC: rt1011: Mark format integer literals as unsigned

Clang warns:

sound/soc/codecs/rt1011.c:1291:12: warning: integer literal is too large
to be represented in type 'long', interpreting as 'unsigned long' per
C89; this literal will have type 'long long' in C99 onwards
[-Wc99-compat]
                format = 2147483648; /* 2^24 * 128 */
                         ^
sound/soc/codecs/rt1011.c:2123:13: warning: integer literal is too large
to be represented in type 'long', interpreting as 'unsigned long' per
C89; this literal will have type 'long long' in C99 onwards
[-Wc99-compat]
                        format = 2147483648; /* 2^24 * 128 */
                                 ^
2 warnings generated.

Mark the integer literals as unsigned explicitly so that if the kernel
does ever bump the C standard it uses, the behavior is consitent.

Fixes: d6e65bb7 ("ASoC: rt1011: Add RT1011 amplifier driver")
Link: https://github.com/ClangBuiltLinux/linux/issues/506


Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>