src/Makefile.am: Include fastrpc headers on target

When running an OE make we want to make `bitbake populate_sdk` to include
relevant fastrpc headers to the path /usr/include/fastrpc.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Change-Id: I88727a653799601b8431d09fecb499b69f104202

src/Makefile.am

@@ -83,3 +83,5 @@ cdsprpcd_DEPENDENCIES = libcdsp_default_listener.la
 cdsprpcd_CFLAGS = -I$(top_srcdir)/inc -DDEFAULT_DOMAIN_ID=3
 cdsprpcd_LDADD =  -ldl
 
+otherincludedir = $(includedir)/fastrpc
+otherinclude_HEADERS = $(top_srcdir)/inc/*.h