mips: mm: Discard ioremap_uncached_accelerated() method

Adaptive ioremap_wc() method is now available as of commit 9748e33e26c6
("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.

[[email protected]:
  - Reword the commit message a little.
  - Remove CC stable.]

Signed-off-by: Serge Semin <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/19790/
Cc: James Hogan <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

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