xtensa: move PLATFORM_NR_IRQS to Kconfig

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

xtensa: rework {CONFIG,PLATFORM}_DEFAULT_MEM_START

Drop PLATFORM_DEFAULT_MEM_START from the platform/hardware.h headers.
Provide definition of CONFIG_DEFAULT_MEM_START always, allow changing it
only

xtensa: rework {CONFIG,PLATFORM}_DEFAULT_MEM_START

Drop PLATFORM_DEFAULT_MEM_START from the platform/hardware.h headers.
Provide definition of CONFIG_DEFAULT_MEM_START always, allow changing it
only in noMMU configurations when PLATFORM_WANT_DEFAULT_MEM is selected.
Change prompt and description so that it's clear that it controls
PAGE_OFFSET and PHYS_OFFSET.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

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xtensa: drop unused {CONFIG,PLATFORM}_DEFAULT_MEM_SIZE

Now that noMMU cache attributes are set up separately drop no longer
used macro PLATFORM_DEFAULT_MEM_SIZE and config symbol
CONFIG_DEFAULT_MEM_

xtensa: drop unused {CONFIG,PLATFORM}_DEFAULT_MEM_SIZE

Now that noMMU cache attributes are set up separately drop no longer
used macro PLATFORM_DEFAULT_MEM_SIZE and config symbol
CONFIG_DEFAULT_MEM_SIZE used for setting it.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

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