mips: mm: Discard ioremap_uncached_accelerated() method

Adaptive ioremap_wc() method is now available as of commit 9748e33e
("mips: mm: Create UCA-based ioremap_wc() method"). We can use it to
obtain UnCached Accelerated (UCA) mappings safely on all MIPS systems,
and so we don't need the MIPS-specific ioremap_uncached_accelerated()
any longer. This macro hard-coded the UCA Cache Coherency Attribute
(CCA) in a manner that isn't safe for kernels that may run on different
CPUs, and it is also entirely unused so we can trivially remove it.

[paul.burton@mips.com:
  - Reword the commit message a little.
  - Remove CC stable.]
Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19790/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: okaya@codeaurora.org
Cc: chenhc@lemote.com
Cc: Sergey.Semin@t-platforms.ru
Cc: linux-kernel@vger.kernel.org

arch/mips/include/asm/io.h

@@ -301,15 +301,11 @@ static inline void __iomem * __ioremap_mode(phys_addr_t offset, unsigned long si
 	__ioremap_mode((offset), (size), boot_cpu_data.writecombine)
 
 /*
- * These two are MIPS specific ioremap variant.	 ioremap_cacheable_cow
- * requests a cachable mapping, ioremap_uncached_accelerated requests a
- * mapping using the uncached accelerated mode which isn't supported on
- * all processors.
+ * This is a MIPS specific ioremap variant. ioremap_cacheable_cow
+ * requests a cachable mapping with CWB attribute enabled.
  */
 #define ioremap_cacheable_cow(offset, size)				\
 	__ioremap_mode((offset), (size), _CACHE_CACHABLE_COW)
-#define ioremap_uncached_accelerated(offset, size)			\
-	__ioremap_mode((offset), (size), _CACHE_UNCACHED_ACCELERATED)
 
 static inline void iounmap(const volatile void __iomem *addr)
 {