arm64: Documentation: Fix broken table in generated HTML

cpu-feature-registers.rst is missing a new line before a couple
of tables listing the visible fields, causing broken tables in
the HTML documentation generated by "make htmldocs". Fix this
by adding the missing new line.

Reported-by: Peter Maydell <[email protected]>
Signed-off-by: Suzuki K Poulose <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Catalin Marinas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: Suzuki K Poulose

Documentation/arm64/cpu-feature-registers.rst

@@ -171,6 +171,7 @@ infrastructure:
 
 
   3) ID_AA64PFR1_EL1 - Processor Feature Register 1
+
      +------------------------------+---------+---------+
      | Name                         |  bits   | visible |
      +------------------------------+---------+---------+
@@ -181,6 +182,7 @@ infrastructure:
 
 
   4) MIDR_EL1 - Main ID Register
+
      +------------------------------+---------+---------+
      | Name                         |  bits   | visible |
      +------------------------------+---------+---------+