DRC: math: Add MATH_EXP to Kernel coniguration

To the kernel configuration for the MATH Window
and the library of auditory functions, add MATH_EXP.

Signed-off-by: shastry <malladi.sastry@intel.com>

Author: ShriramShastry

src/math/Kconfig

@@ -142,6 +142,7 @@ config MATH_WINDOW
 	default n
 	select CORDIC_FIXED
 	select NATURAL_LOGARITHM_FIXED
+	select MATH_EXP
 	help
           Select this to build a library for window functions. The window functions
           are used to mitigate artefacts (from nature of FFT) to spectra when
@@ -163,7 +164,7 @@ config MATH_AUDITORY
 	bool "Auditory functions library"
 	default n
 	select NATURAL_LOGARITHM_FIXED
-
+	select MATH_EXP
 	help
 	  Select this to build a psychoacoustics and auditory system related
 	  functions library. Currently the library provides functions for Mel