Do not descend to sub-directories when unneeded.

I used subdir-$(CONFIG_...) for hidraw, seccomp, and statx because
they only contain host programs.

While we are here, let's add SPDX License tag, and sort the directories
alphabetically.

Signed-off-by: Masahiro Yamada <yamada.masah...@socionext.com>
---

 samples/Makefile | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/samples/Makefile b/samples/Makefile
index 50f8586..0f2d70d 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -1,6 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0
 # Makefile for Linux samples code
 
-obj-y                  += kobject/ kprobes/ trace_events/ livepatch/ \
-                          hw_breakpoint/ kfifo/ kdb/ hidraw/ rpmsg/ seccomp/ \
-                          configfs/ connector/ v4l/ trace_printk/ \
-                          vfio-mdev/ statx/ qmi/ binderfs/
+obj-$(CONFIG_SAMPLE_ANDROID_BINDERFS)  += binderfs/
+obj-$(CONFIG_SAMPLE_CONFIGFS)          += configfs/
+obj-$(CONFIG_SAMPLE_CONNECTOR)         += connector/
+subdir-y                               += hidraw
+obj-$(CONFIG_SAMPLE_HW_BREAKPOINT)     += hw_breakpoint/
+obj-$(CONFIG_SAMPLE_KDB)               += kdb/
+obj-$(CONFIG_SAMPLE_KFIFO)             += kfifo/
+obj-$(CONFIG_SAMPLE_KOBJECT)           += kobject/
+obj-$(CONFIG_SAMPLE_KPROBES)           += kprobes/
+obj-$(CONFIG_SAMPLE_LIVEPATCH)         += livepatch/
+obj-$(CONFIG_SAMPLE_QMI_CLIENT)                += qmi/
+obj-$(CONFIG_SAMPLE_RPMSG_CLIENT)      += rpmsg/
+subdir-$(CONFIG_SAMPLE_SECCOMP)                += seccomp
+subdir-$(CONFIG_SAMPLE_STATX)          += statx
+obj-$(CONFIG_SAMPLE_TRACE_EVENTS)      += trace_events/
+obj-$(CONFIG_SAMPLE_TRACE_PRINTK)      += trace_printk/
+obj-$(CONFIG_VIDEO_PCI_SKELETON)       += v4l/
+obj-y                                  += vfio-mdev/
-- 
2.7.4

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