techpack: makefile: do not export all the variables

This patch fixes an issue with all the functions defined in
scripts/Makefile.lib gets called everytime when this makefile is
included thus causing the build to slow down.

Bug: 118818737
Change-Id: I4929e64d53a0bc865b12a27cce37520be52c9744
Signed-off-by: Thierry Strudel <[email protected]>

Author: Thierry Strudel

techpack/audio/Makefile

@@ -1,15 +1,15 @@
 # auto-detect subdirs
 ifeq ($(CONFIG_ARCH_SDM845), y)
 include $(srctree)/techpack/audio/config/sdm845auto.conf
-export
+export $(shell sed 's/=.*//' $(srctree)/techpack/audio/config/sdm845auto.conf)
 endif
 ifeq ($(CONFIG_ARCH_SDM670), y)
 include $(srctree)/techpack/audio/config/sdm670auto.conf
-export
+export $(shell sed 's/=.*//' $(srctree)/techpack/audio/config/sdm670auto.conf)
 endif
 ifeq ($(CONFIG_ARCH_SDXPOORWILLS), y)
 include $(srctree)/techpack/audio/config/sdxpoorwillsauto.conf
-export
+export $(shell sed 's/=.*//' $(srctree)/techpack/audio/config/sdxpoorwillsauto.conf)
 endif
 
 # Use USERINCLUDE when you must reference the UAPI directories only.