doc: release: 2.6: Add notes about Cypress related changes

Add 2.6.0 release notes for Cypress SoCs, boards, and drivers.

Signed-off-by: Gerson Fernando Budke <gerson.budke@atl-electronics.com>

doc/releases/release-notes-2.6.rst

diff --git a/doc/releases/release-notes-2.6.rst b/doc/releases/release-notes-2.6.rst
index 443fbae..6c3ef7a 100644
--- a/doc/releases/release-notes-2.6.rst
+++ b/doc/releases/release-notes-2.6.rst
@@ -233,6 +233,8 @@
 
 * Made these changes in other SoC series:
 
+  * Added Cypress PSoC-6 pinctrl support.
+
 * Changes for ARC boards:
 
 * Added support for these ARM boards:
@@ -252,6 +254,13 @@
 
 * Made these changes in other boards:
 
+  * cy8ckit_062_ble: Refactored to configure by pinctrl.
+  * cy8ckit_062_ble: Added support to SCB[uart] with interrupt.
+  * cy8ckit_062_ble: Added support to SCB[spi].
+  * cy8ckit_062_ble: Added board revision schema.
+  * cy8ckit_062_wifi_bt: Refactored to configure by pinctrl.
+  * cy8ckit_062_wifi_bt: Added support to SCB[uart] with interrupt.
+
 * Added support for these following shields:
 
 Drivers and Sensors
@@ -358,8 +367,12 @@
 
 * Serial
 
+  * Extended Cypress PSoC-6 SCB[uart] driver to support interrupts.
+
 * SPI
 
+  * Added Cypress PSoC-6 SCB[spi] driver.
+
 * Timer
 
 * USB