Delete unused functions in format parser

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Neil Roberts <neil@linux.intel.com>

src/mesa/main/format_parser.py

@@ -40,9 +40,6 @@ SRGB = 'srgb'
 YUV = 'yuv'
 ZS = 'zs'
 
-def is_power_of_two(x):
-   return not bool(x & (x - 1))
-
 VERY_LARGE = 99999999999999999999999
 
 class Channel:
@@ -100,10 +97,6 @@ class Channel:
       else:
          return 1
 
-   def is_power_of_two(self):
-      """Returns true if the size of this channel is a power of two."""
-      return is_power_of_two(self.size)
-
    def datatype(self):
       """Returns the datatype corresponding to a channel type and size"""
       return _get_datatype(self.type, self.size)