drivers: add RISC-V APLIC interrupt driver

The RISC-V Advanced Interrupt Architecture (AIA) specification introduces
the APLIC, which can serve as a new external interrupt controller to
replace the

drivers: add RISC-V APLIC interrupt driver

The RISC-V Advanced Interrupt Architecture (AIA) specification introduces
the APLIC, which can serve as a new external interrupt controller to
replace the original Platform-Level Interrupt Controller (PLIC) or as a
device to convert wired interrupts into message-signaled interrupts
(MSIs) and forward them to the Incoming MSI Controller (IMSIC).

The APLIC driver supports both "direct delivery mode" and
"MSI delivery mode." Use the `CFG_RISCV_APLIC` flag to enable the
APLIC driver in "direct delivery mode," and use the
`CFG_RISCV_APLIC_MSI` flag to enable the APLIC driver in "MSI
delivery mode" when selecting `CFG_RISCV_IMSIC`.

APLIC initialization can be done through the device tree.

For more details, see: https://github.com/riscv/riscv-aia

Signed-off-by: Huang Borong <huangborong@bosc.ac.cn>
Reviewed-by: Alvin Chang <alvinga@andestech.com>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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