[source] kernel: backport MIPS's ioremap_cache from 4.5

[LEDE Commits]

rmilecki pushed a commit to source.git, branch master:
https://git.lede-project.org/93f9a9c71ce0aef64aa9bc27e3725eddf5c67f0a

commit 93f9a9c71ce0aef64aa9bc27e3725eddf5c67f0a
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Mon Oct 24 22:52:44 2016 +0200

    kernel: backport MIPS's ioremap_cache from 4.5
    
    It's needed by (updated) bcm47xxsflash driver.
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 .../097-MIPS-io.h-Define-ioremap_cache.patch       | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/target/linux/generic/patches-4.4/097-MIPS-io.h-Define-ioremap_cache.patch b/target/linux/generic/patches-4.4/097-MIPS-io.h-Define-ioremap_cache.patch
new file mode 100644
index 0000000..e048410
--- /dev/null
+++ b/target/linux/generic/patches-4.4/097-MIPS-io.h-Define-ioremap_cache.patch
@@ -0,0 +1,29 @@
+From a68f376844605399cbd28b662d5ed213639f46f7 Mon Sep 17 00:00:00 2001
+From: "Maciej W. Rozycki" <macro at imgtec.com>
+Date: Sat, 9 Jan 2016 02:05:31 +0000
+Subject: [PATCH] MIPS: io.h: Define `ioremap_cache'
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Signed-off-by: Maciej W. Rozycki <macro at imgtec.com>
+Cc: Brian Norris <computersforpeace at gmail.com>
+Cc: Rafał Miłecki <zajec5 at gmail.com>
+Cc: linux-mips at linux-mips.org
+Cc: linux-kernel at vger.kernel.org
+Patchwork: https://patchwork.linux-mips.org/patch/12040/
+Signed-off-by: Ralf Baechle <ralf at linux-mips.org>
+---
+ arch/mips/include/asm/io.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/arch/mips/include/asm/io.h
++++ b/arch/mips/include/asm/io.h
+@@ -275,6 +275,7 @@ static inline void __iomem * __ioremap_m
+  */
+ #define ioremap_cachable(offset, size)					\
+ 	__ioremap_mode((offset), (size), _page_cachable_default)
++#define ioremap_cache ioremap_cachable
+ 
+ /*
+  * These two are MIPS specific ioremap variant.	 ioremap_cacheable_cow