Add Via support for Percent Canoe (#9276)

* Add Via support for Percent Canoe

* Removed unnecessary flags from rules.mk

* Changes as per PR

 * Added 2 additional empty layers (for a total of 4)
 * Set a unique vendor id for all percent studio boards
 * Set a unique product id for the canoe

* Fixed formatting, removed trailing comma

* Fixed PS/PT typo for vendor id

* Removed unnecessary variables

* Removed unnecessary slashes

* Fixed missing layer name

keyboards/percent/canoe/keymaps/via/rules.mk

@@ -0,0 +1,4 @@
+VIA_ENABLE = yes
+LTO_ENABLE = yes
+
+EXTRAKEY_ENABLE = no