[SRU][F/J/L] [PATCH 0/1] enable Renesas RZ platform serial installer

[Andrea Righi]

BugLink: https://bugs.launchpad.net/bugs/2022361

[Impact]

The ubuntu installer does not work via serial ports for Renesas boards
like RZ/G2M-HiHope
(https://www.renesas.com/us/en/products/microcontrollers-microprocessors/rz-mpus/rzg2m-hihope-rzg2m-reference-board,
RZ/G2L, RZ/G2LC, RZ/G2UL SMARC Board
(https://renesas.info/wiki/RZ-G/RZ-G2L_SMARC).

The installation can be done using HDMI ports, but it would be nice to
support installation via serial port as well.

[Test case]

Try to install Ubuntu on a Renesas board.

[Fix]

Statically build SuperH SCI(F) serial port support (with earlyconsole).

[Regression potential]

Statically building an additional driver in the kernel can make the
kernel image bigger, potentially causing boot issues in small (arm64 /
armhf) platforms.