Bump buidlroot version to 2018.02.6

bsp/buildroot/board/qemu/or1k/patches/linux/0001-ld-or1k.patch

@@ -1,16 +0,0 @@
-OpenRISC arch name was in the beginning or32
-
-Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
-
-diff -Nur linux-4.4.5.orig/arch/openrisc/kernel/vmlinux.lds.S linux-4.4.5/arch/openrisc/kernel/vmlinux.lds.S
---- linux-4.4.5.orig/arch/openrisc/kernel/vmlinux.lds.S	2016-03-10 00:35:58.000000000 +0100
-+++ linux-4.4.5/arch/openrisc/kernel/vmlinux.lds.S	2016-03-16 09:21:07.933535532 +0100
-@@ -30,7 +30,7 @@
- #include <asm/cache.h>
- #include <asm-generic/vmlinux.lds.h>
- 
--OUTPUT_FORMAT("elf32-or32", "elf32-or32", "elf32-or32")
-+OUTPUT_FORMAT("elf32-or1k", "elf32-or1k", "elf32-or1k")
- jiffies = jiffies_64 + 4;
- 
- SECTIONS

bsp/buildroot/board/qemu/or1k/patches/linux/0002-kallsyms.patch

@@ -1,25 +0,0 @@
-From: https://lkml.org/lkml/2016/12/31/13
-
-The build robot reports:
-
-   .tmp_kallsyms1.o: In function `kallsyms_relative_base':
->> (.rodata+0x8a18): undefined reference to `_text'
-
-This is when using 'make alldefconfig'. Adding this _text symbol to mark
-the start of the kernel as in other architecture fixes this.
-
-Signed-off-by: Stafford Horne <shorne@gmail.com>
-Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
-
-diff -Nur linux-4.9.orig/arch/openrisc/kernel/vmlinux.lds.S linux-4.9/arch/openrisc/kernel/vmlinux.lds.S
---- linux-4.9.orig/arch/openrisc/kernel/vmlinux.lds.S	2016-12-11 20:17:54.000000000 +0100
-+++ linux-4.9/arch/openrisc/kernel/vmlinux.lds.S	2017-01-01 12:13:43.039107518 +0100
-@@ -38,6 +38,8 @@
-         /* Read-only sections, merged into text segment: */
-         . = LOAD_BASE ;
- 
-+	_text = .;
-+
- 	/* _s_kernel_ro must be page aligned */
- 	. = ALIGN(PAGE_SIZE);
- 	_s_kernel_ro = .;

bsp/buildroot/board/qemu/or1k/readme.txt

@@ -1,9 +1,9 @@
 Run the emulation with:
 
- qemu-system-or32 -kernel output/images/vmlinux -nographic
+ qemu-system-or1k -kernel output/images/vmlinux -nographic
 
 The login prompt will appear in the terminal that started Qemu.
 
 Ethernet support is not working, yet.
 
-Tested with QEMU 2.8.0.
+Tested with QEMU 2.9.0.