config: cnl: change image_size to the real SRAM size

We have 47 bank HP and 1 bank LP SRAM on CNL, change to toml config file
to reflect that.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>

Author: keyonjie

config/cnl.toml

@@ -3,7 +3,7 @@ version = [1, 8]
 [adsp]
 name = "cnl"
 machine_id = 8
-image_size = "0x100000"
+image_size = "0x300000"	# (47 + 1) bank * 64KB
 
 [[adsp.mem_zone]]
 type = "ROM"