RISC-V: Provide a more helpful error message on invalid ISA strings

RISC-V: Provide a more helpful error message on invalid ISA strings

Right now we provide a somewhat unhelpful error message on systems with
invalid error messages, something along the lines of

	CPU with hartid=0 is not available
	------------[ cut here ]------------
	kernel BUG at arch/riscv/kernel/smpboot.c:174!
	Kernel BUG [#1]
	Modules linked in:
	CPU: 0 PID: 0 Comm: swapper Not tainted 6.4.0-rc1-00096-ge0097d2c62d5-dirty #1
	Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)
	epc : of_parse_and_init_cpus+0x16c/0x16e
	 ra : of_parse_and_init_cpus+0x9a/0x16e
	epc : ffffffff80c04e0a ra : ffffffff80c04d38 sp : ffffffff81603e20
	 gp : ffffffff8182d658 tp : ffffffff81613f80 t0 : 000000000000006e
	 t1 : 0000000000000064 t2 : 0000000000000000 s0 : ffffffff81603e80
	 s1 : 0000000000000000 a0 : 0000000000000000 a1 : 0000000000000000
	 a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
	 a5 : 0000000000001fff a6 : 0000000000001fff a7 : ffffffff816148b0
	 s2 : 0000000000000001 s3 : ffffffff81492a4c s4 : ffffffff81a4b090
	 s5 : ffffffff81506030 s6 : 0000000000000040 s7 : 0000000000000000
	 s8 : 00000000bfb6f046 s9 : 0000000000000001 s10: 0000000000000000
	 s11: 00000000bf389700 t3 : 0000000000000000 t4 : 0000000000000000
	 t5 : ffffffff824dd188 t6 : ffffffff824dd187
	status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000003
	[<ffffffff80c04e0a>] of_parse_and_init_cpus+0x16c/0x16e
	[<ffffffff80c04c96>] setup_smp+0x1e/0x26
	[<ffffffff80c03ffe>] setup_arch+0x6e/0xb2
	[<ffffffff80c00384>] start_kernel+0x72/0x400
	Code: 80e7 4a00 a603 0009 b795 1097 ffe5 80e7 92c0 9002 (9002) 715d
	---[ end trace 0000000000000000 ]---
	Kernel panic - not syncing: Fatal exception in interrupt

Add a warning for the cases where the ISA string isn't valid.  It's still
above the BUG_ON cut, but hopefully it's at least a bit easier for users.

Reviewed-by: Evan Green <evan@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230713-endless-spearhead-62a5a4b149bd@wendy
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>