Integrate spec files and activate emulator-kernel.spec

Integrate spec files and activate emulator-kernel.spec

This PR is to remove unnecessary and duplicated spec files.
And, it is to activate the kernel image (bzImage) and System
map file (System.map) with gbs build as well as build scripts
such as build_x86.sh and build_x86_64.sh.

**Changes proposed in this PR:**

* Changelog v3:
1. Appended symbolic link with /usr/src/linux-headers for compatibility

* Changelog v2:
1. Applied the comments of @Mikhail Labiuk and @MyungJoo Ham

* Changelog v1:
1. bzImage is used to run emulator rootfs based on QEMU/KVM
2. System.map is used to do debugging kernel functions
3. Removed unnecessary spec files
4. Integrated the spec files into one spec file for consistency
5. Added kernel-headers rpm to support kernel module build of arm/aarch64

**Self assessment:**
1. GBS build: Passed
1. OBS build: Passed (manually)

**How to evaluate:**
1. x86/32bit: time gbs build -A i586    --clean --include-all --define "with emulator"
2. x86/64bit: time gbs build -A x86_64  --clean --include-all --define "with emulator"
3. arm/32bit: time gbs build -A armv7l  --clean --include-all --define "with emulator"
4. arm/64bit: time gbs build -A aarch64 --clean --include-all --define "with emulator"

**After this PR:**
$ ls -al /home/leemgs/GBS-ROOT-4.0/local/repos/tizen/i586/RPMS
drwxrwxr-x 2 invain invain     4096  4월 10 17:16 .
drwxrwxr-x 6 invain invain     4096  4월 10 17:16 ..
-rw-rw-r-- 2 invain invain  7175827  4월 10 17:15 emulator-kernel-4.4.35-0.i686.rpm
-rw-rw-r-- 2 invain invain   338716  4월 10 17:15 emulator-kernel-debugsource-4.4.35-0.i686.rpm
-rw-rw-r-- 2 invain invain 59980920  4월 10 17:15 emulator-kernel-devel-4.4.35-0.i686.rpm
-rw-rw-r-- 2 invain invain  1936999  4월 10 17:16 emulator-kernel-devel-debuginfo-4.4.35-0.i686.rpm
-rw-rw-r-- 2 invain invain   580448  4월 10 17:15 emulator-kernel-modules-4.4.35-0.i686.rpm
-rw-rw-r-- 2 invain invain  1026336  4월 10 17:15 emulator-kernel-perf-4.4.35-0.i686.rpm
-rw-rw-r-- 2 invain invain  1721079  4월 10 17:16 emulator-kernel-perf-debuginfo-4.4.35-0.i686.rpm
-rw-rw-r-- 2 invain invain   883864  4월 10 17:15 emulator-kernel-user-headers-4.4.35-0.i686.rpm

Change-Id: I80607659c6fb66ee45ccd2d683d23c9f2c642cfc
Signed-off-by: Geunsik Lim <geunsik.lim@samsung.com>