arc: Update exception & interrupt handling for ARCv2

Initially IVT for ARCv2 was simply copypasted from ARCompact
with some selected fixes so basic stuff works.

Now we update it with more ARCv2 spe

arc: Update exception & interrupt handling for ARCv2

Initially IVT for ARCv2 was simply copypasted from ARCompact
with some selected fixes so basic stuff works.

Now we update it with more ARCv2 specific vectors like
* Software Interrupt
* Division by zero
* Data cache consistency error
* Misaligned access

Also normal interrupts are now implemented properly and extened to
all possible 240 items.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

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Merge branch 'u-boot/master'

Merge git://git.denx.de/u-boot-arc

arc: merge common start-up code between ARC and ARCv2

Even though ARCompact and ARCv2 are not binary compatible most of
assembly instructions are used in both. With this change we'll get rid
of dupl

arc: merge common start-up code between ARC and ARCv2

Even though ARCompact and ARCv2 are not binary compatible most of
assembly instructions are used in both. With this change we'll get rid
of duplicate code.

Still IVTs are implemented differently so we're keeping them in separate
files.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

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