console: Plumb in the pager

Send all console output via the pager. If it is disabled, it will do
nothing.

The pager is only supported if CONSOLE_MUX and SYS_CONSOLE_IS_IN_ENV are
enabled. This is the common case for more richly featured boards, i.e.
those that can cope with the extra code size of this feature.

Series-changes: 2
- Drop an unnecessary direct call to the pager
- Repeat the old code in console_puts_pager() to avoid 16-byte growth

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

common/Kconfig

@@ -344,6 +344,15 @@ config CONSOLE_PAGER
 	  controlled by the 'pager' environment variable. If the variable is
 	  not set or is empty, paging is disabled.
 
+config CONSOLE_PAGER_LINES
+	int "Number of lines per page"
+	depends on CONSOLE_PAGER
+	default 25
+	help
+	  Sets the default number of lines that the pager assumes is visible on
+	  the display. This is used as a default if the "pager" environment
+	  variable is unset.
+
 endmenu
 
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