Add support for RISC-V AIA IMSIC

[D3boker1]

RISC-V AIA APLIC support:

• Change the Bao's interrupt reservation mechanism;
• Add MSI Mode support in (V)APLIC driver;
• IMSIC driver.
• VIMSIC driver

Software Versions:

QEMU - v7.1.0
Linux - https://github.com/avpatel/linux/tree/riscv_aia_v1
OpenSBI - 1.2

[josecm]

@D3boker1 before starting the review I'd ask you to:

1. Resolve the conflicts with the main branch;
2. Make the history a little more granular, so we can better understand the structure of the introduced changes.