csky: Minimize defconfig to support buildroot config.fragment

Some bsp (eg: buildroot) has defconfig.fragment design to add more
configs into the defconfig in linux source code tree. For example,
we

csky: Minimize defconfig to support buildroot config.fragment

Some bsp (eg: buildroot) has defconfig.fragment design to add more
configs into the defconfig in linux source code tree. For example,
we could put different cpu configs into different defconfig.fragments,
but they all use the same defconfig in Linux.

Signed-off-by: Ma Jun <majun258@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>

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csky: Cleanup old Kconfig options

CONFIG_CLKSRC_OF is gone since commit bb0eb050a577
("clocksource/drivers: Rename CLKSRC_OF to TIMER_OF"). The platform
already selects TIMER_OF.

CONFIG_HAVE_DMA_A

csky: Cleanup old Kconfig options

CONFIG_CLKSRC_OF is gone since commit bb0eb050a577
("clocksource/drivers: Rename CLKSRC_OF to TIMER_OF"). The platform
already selects TIMER_OF.

CONFIG_HAVE_DMA_API_DEBUG is gone since commit 6e88628d03dd ("dma-debug:
remove CONFIG_HAVE_DMA_API_DEBUG").

CONFIG_DEFAULT_DEADLINE is gone since commit f382fb0bcef4 ("block:
remove legacy IO schedulers").

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>

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