[build] Fix 'make kimage'

Some builds were improper due to not waiting for kernel build to finish
before starting application installation.

Author: ghaerr

Makefile

@@ -23,7 +23,9 @@ image:
 images:
 	$(MAKE) -C image images
 
-kimage: kernel image
+kimage:
+	$(MAKE) -C elks all
+	$(MAKE) -C image
 
 kernel:
 	$(MAKE) -C elks all
@@ -92,6 +94,9 @@ defconfig:
 	$(RM) .config
 	@yes '' | ${MAKE} config
 
+yesconfig:
+	@yes '' | ${MAKE} config
+
 include/autoconf.h: .config
 	@yes '' | config/Configure -D config.in