chapter3: drop boot-hartid

Drop RISC-V boot hartid requirement as it is ignored as of UEFI 2.10.

Signed-off-by: Vincent Stehlé <[email protected]>

source/chapter3-secureworld.rst

@@ -33,6 +33,3 @@ RISC-V Multiprocessor Startup Protocol
 The resident firmware in M mode or hypervisor running in HS mode must implement
 and conform to at least SBI [RVSBISPEC]_ v0.2 with HART State Management(HSM)
 extension for both RV32 and RV64.
-The firmware must also provide a devicetree containing a ``boot-hartid`` property
-under the ``/chosen`` node before jumping to a UEFI application.
-This property must indicate the id of the booting HART.