RISC-V: alternatives: Support patching multiple insns in assembly

As pointed out in commit d374a16539b1 ("RISC-V: fix compile error
from deduplicated __ALTERNATIVE_CFG_2"), we need quotes around
parameters passed to macros within macros to avoid spaces being
interpreted as separators. ALT_NEW_CONTENT was trying to handle
this by defining new_c has a vararg, but this isn't sufficient
for calling ALTERNATIVE() from assembly with multiple instructions
in the new/old sequences. Remove the vararg "hack" and use quotes.

Signed-off-by: Andrew Jones <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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