Revert "[Huawei] RISC-V: Add Microchip PolarFire kconfig option"

hulk inclusion
category: bugfix
bugzilla: 49892
CVE: NA

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This reverts commit 536f67936ebf0b2fdea99f04b31ceaec09cc6a8f.
Reviewed-by: Mingwang Li <limingwang@huawei.com>

Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>