install modules.softdep from depmod output

The modules.softdep file is used to communicate soft dependencies
between modules and is supported by libmodprobe.

Bug: 130585369
Change-Id: I790ea872fde7fb0cb58e07277a32aa4688adcac6
diff --git a/core/Makefile b/core/Makefile
index 41a1d52..ca00476 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -659,6 +659,7 @@
   $(eval $(call build-image-kernel-modules-depmod,$(1),$(3),$(4),$(5),$(6))) \
   $(4)/$(DEPMOD_STAGING_SUBDIR)/modules.dep:$(2)/lib/modules/modules.dep \
   $(4)/$(DEPMOD_STAGING_SUBDIR)/modules.alias:$(2)/lib/modules/modules.alias \
+  $(4)/$(DEPMOD_STAGING_SUBDIR)/modules.softdep:$(2)/lib/modules/modules.softdep \
   $(4)/$(DEPMOD_STAGING_SUBDIR)/$(6):$(2)/lib/modules/$(6)
 endef
 
@@ -668,7 +669,7 @@
 # $(4): module load list
 # $(5): module load list filename
 define build-image-kernel-modules-depmod
-$(3)/$(DEPMOD_STAGING_SUBDIR)/modules.dep: .KATI_IMPLICIT_OUTPUTS := $(3)/$(DEPMOD_STAGING_SUBDIR)/modules.alias $(3)/$(DEPMOD_STAGING_SUBDIR)/$(5)
+$(3)/$(DEPMOD_STAGING_SUBDIR)/modules.dep: .KATI_IMPLICIT_OUTPUTS := $(3)/$(DEPMOD_STAGING_SUBDIR)/modules.alias $(3)/$(DEPMOD_STAGING_SUBDIR)/modules.softdep $(3)/$(DEPMOD_STAGING_SUBDIR)/$(5)
 $(3)/$(DEPMOD_STAGING_SUBDIR)/modules.dep: $(DEPMOD)
 $(3)/$(DEPMOD_STAGING_SUBDIR)/modules.dep: PRIVATE_MODULES := $(1)
 $(3)/$(DEPMOD_STAGING_SUBDIR)/modules.dep: PRIVATE_MOUNT_POINT := $(2)